The NYPD confirmed Trachtenberg was found “unconscious and unresponsive” by police and pronounced dead by EMS workers. Her death is not deemed suspicious. Trachtenberg shared a throwback photo with Instagram followers on Feb. 18. The close-up shot showed the “Gossip Girl” vet on the red carpet.

Eugenie became friends with Trachtenberg when she lived in New York City and worked for the art auction start-up Paddle8 from 2013 to 2015. Their friendship first became public in December 2013, when they were photographed courtside at a Knicks game alongside actor Michael K.

Princess Eugenie is mourning the death of her friend Michelle Trachtenberg. The royal took to her Instagram to share a throwback photo of herself with the late actress.